Electric circuit to prevent arcing at opening contacts, has three controlling elements and two timers to hold voltage below arcing level

摘要

An electrical circuit to prevent arcing at opening contacts in parallel to the contact comprises two controllable components (T1,T2), a monostable tip switch (T4) with a timer (C3) and a nonlinear current/voltage limiting element. A third, parallel, control which shorts the second for a time given by a second timer (C1) to prevent switch re-triggering.